42022440 has 96 divisors (see below), whose sum is σ = 137914920. Its totient is φ = 11096064.

The previous prime is 42022439. The next prime is 42022451. The reversal of 42022440 is 4422024.

42022440 = T₆₇ + T₆₈ + ... + T₆₃₁.

42022440 is a `hidden beast` number, since 420 + 2 + 244 + 0 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 32695524 + 9326916 = 5718^2 + 3054^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 40164 + ... + 41196.

Almost surely, 2^42022440 is an apocalyptic number.

42022440 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 42022440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (68957460).

42022440 is an abundant number, since it is smaller than the sum of its proper divisors (95892480).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

42022440 is a wasteful number, since it uses less digits than its factorization.

42022440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1163 (or 1156 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 18.

The square root of 42022440 is about 6482.4717508062. The cubic root of 42022440 is about 347.6645598460.

Adding to 42022440 its reverse (4422024), we get a palindrome (46444464).

The spelling of 42022440 in words is "forty-two million, twenty-two thousand, four hundred forty".